Avoid unsafe extraction in BindingReducer
#3315
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We currently have a single case of `AnyCasePath(unsafe:)` in the code base, which uses reflection for extraction, and is something we would like to remove in a future major version of Case Paths. This explores a refactoring of `BindingReducer` that takes an explicit case key path toe the binding action case, instead: ```swift BindingReducer(action: \.binding) ``` `BindableAction` as a protocol is still necessary for bindable stores to know how to embed binding actions in a short syntax, _e.g._ `$store.text`. It's a slight bummer that the reducer gets slightly more verbose, especially when there _is_ something abstractable here, I'm just not sure Swift provides the tools yet to truly abstract over a case path in an ergonomic fashion. The alternative would be to introduce a special protocol (`BindableCasePath`?) that the `@Reducer` macro would need to apply correctly when detecting a `BindableAction`, but this is one-off logic that seems to take things in the wrong direction.
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We currently have a single case of
AnyCasePath(unsafe:)in the code base, which uses reflection for extraction, and is something we would like to remove in a future major version of Case Paths.This explores a refactoring of
BindingReducerthat takes an explicit case key path to the binding action case, instead:BindableActionas a protocol is still necessary for bindable stores to know how to embed binding actions in a short syntax, e.g.$store.text.It's a slight bummer that the reducer gets slightly more verbose, especially when there is something abstractable here, I'm just not sure Swift provides the tools yet to truly abstract over a case path in an ergonomic fashion.
The alternative would be to introduce a special protocol (
BindableCasePath?) that the@Reducermacro would need to apply correctly when detecting aBindableAction, but this is one-off logic that seems to take things in the wrong direction.This is a draft for now that does not clean up all the existing occurrences, as I'm not sure we want to complete and merge it.